Suzuki Ignis Service Manual page 3377

6-176 ENGINE GENERAL INFORMATION AND DIAGNOSIS
TROUBLESHOOTING
Step
1 Check engine idle speed and IAC duty referring
to "Idle speed/idle air control (IAC) duty inspec-
tion" in Section 6E1.
Is idle speed within specification?
2 Is IAC duty within specification in Step 1?
3 Is engine idle speed kept specified speed even
with headlight ON?
4 Was idle speed higher than specification in
Step 1?
5 Check A/C (input) signal circuit referring to Step
1 of "Table B-5 A/C Signal Circuits Check
(Vehicle with A/C)", if equipped.
Is it in good condition?
6 Check Idle Air Control system.
1) Remove IAC valve from throttle body refer-
ring to "Idle air control (IAC) valve removal
and installation" in Section 6E1.
2) Check IAC valve for operation referring to
"Idle air control (IAC) valve inspection" in
Section 6E1. See Fig. 1.
Is check result satisfactory?
7 Check Wire Harness for Open or Short.
1) Turn ignition switch OFF.
2) Disconnect IAC valve connector.
3) Check for proper connection to IAC valve at
each terminals.
4) If OK, disconnect connectors from ECM.
5) Check for proper connection to ECM at
"C64-10", "C64-9", "C64-8" and "C64-28"
terminals.
6) If OK, check "BLK/RED", "RED/WHT",
"RED/ORN", "RED/YEL" and "RED/BLK"
circuit for open or short.
Are they in good condition?
Action Yes
Go to Step 2.
Go to Step 3.
System is in good condi-
tion.
Go to Step 5.
Go to Step 6.
Intermittent trouble or
faulty ECM.
Check for intermittent
referring to "Intermittent
and Poor Connection" in
Section 0A.
Replace IAC valve and
recheck.
No
Go to Step 4.
Check for followings:
Vacuum leak
EVAP canister purge con-
trol system
Clog of IAC air passage
Accessory engine load
"Table B-6 Electric Load
Signal Circuit Check"
Closed throttle position
(TP sensor)
Stuck to PCV valve.
Go to Step 6.
Go to Step 6.
Repair or replace A/C sig-
nal circuit or A/C system.
Go to Step 7.
Repair or replace.